reset MERCEDES-BENZ C-CLASS CABRIOLET 2021 Owners Manual

Moreo
ver,connecting equipment tothe diagnos‐
tics connection can lead toemissions monitor‐
ing information being reset, forex ample. This
may lead totheve hicle failing tomeet the
re qu irements of the next emissions inspection
during the main inspection. Qualified specialist
workshop
A qu alified specialist workshop has the neces‐
sary special skills, tools and qualifications to
cor rectly car ryout any necessary workon your
ve hicle. This particularly applies tosaf ety-re le‐
va nt wo rks.
Alw ays ha vethefo llowing workcar ried out on
yo ur vehicle at a qualified specialist workshop:
R safety-re leva nt wo rks
R service and maintenance work
R repair work
R modifications as well as ins tallations and
con versions
R workon electronic components R
vehicles with 48 V on-board electrical
sy stem (EQ boost tech nology): workon
high voltage components of the 48 V on-
board electrical sy stem
Mercedes‑Benz recommends a Mercedes‑Benz
service centre. Ve
hicle registration
Mercedes-Benz may ask its service centres to
car ryout tech nical inspections on cer tain vehi‐
cles. The quality or saf ety of theve hicle is
impr oved as a result of the inspection.
Mercedes-Benz can only inform you about vehi‐
cle checks if Mercedes-Benz has your registra‐
tion data.
It is possible that your vehicle has not yet been
re gis tere d in your name in thefo llowing cases:
R ifyo ur vehicle was not pur chased at an
authorised specialist dealer.
R ifyo ur vehicle has not yet been examined at
a Mercedes-Benz service centre. It is advisable
toregis teryo ur vehicle with a
Mercedes-Benz service centre.
Inform Mercedes-Benz as soon as possible
about any change in address or vehicle owner‐
ship. You can do this at a Mercedes-Benz service
centre, forex ample. Cor
rect use of theve hicle
If yo ure mo veany warning sticke rs,yo u or others
could failto recognise cer tain dangers. Lea ve
wa rning sticke rs in position.
Obser vethefo llowing information in particular
when driving your vehicle:
R the saf ety no tes in this manual
R tech nical da taforth eve hicle
R traf fic ru les and regulations
R laws and saf etyst andards per taining to
mo torve hicles Information on
the REACH regulation
EU and EFTA countries onl y: Gene
ral no tes 31

tion, number of wheel
revo lutions or thefa s‐
te ned seat belts displ ay
R ambient conditions, such as temp erature,
ra in sensor or dis tance sensor
General ly,th e use of these data is temp orar y;
th ey will not be stored be yond the period of
operation and will only be processed within the
ve hicle itself. Control units of ten contain da ta
memories forve hicle keys,fo rex ample. Their
use permits thete mp orary or permanent docu‐
mentation of tech nical information about the
ve hicle's operating state, component loads,
main tenance requ irements and tech nical events
or faults.
Depending on theve hicle equipment, thefo llow‐
ing data are stored:
R operating status of sy stem components,
such as fill le vels, tyre pressure or battery
st atus
R malfunctions or faults in impor tant sy stem
components, such as lights or brakes
R system reactions in special driving situations,
such as airbag deployment or the inter ven‐
tion of stability control sy stems R
information on events leading tovehicle
damage
In cer tain cases, it may be requiredtostore data
th at wo uld ha veotherwise been used only tem‐
poraril y.This may be the case if theve hicle has
de tected a malfunction, forex ample.
If yo u use services, such as repair services and
maintenance work,st ored operational data as
we ll as theve hicle identification number can be
re ad out and used. They can be read out by
service network emplo yees, such as workshops
and manufacturers or third parties, such as
breakdown services. The same is true in the
case of warranty claims and quality assurance
measures.
In general, there adout is per form ed via the
legally prescribed port forth e diagnostics con‐
nection in theve hicle. The operational data that
are read out document tech nical states of the
ve hicle or of individual components and assist in
th e diagnosis of malfunctions, compliance with
wa rranty obligations and quality impr ovement.
To that end, these data, in particular information
about component loads, tech nical events, mal‐ functions and
other faults may be transmitted
along with theve hicle identification number to
th e manufacturer. Furthermore, the manufac‐
turer is subject toproduct liability. Forth is rea‐
son the manufacturer also uses operational data
from theve hicle, forex ample, forre calls. These
da ta can also be used toexamine the cus tom‐
er's warranty and guarantee claims.
Fa ult memories in theve hicle can be reset by a
service outlet or at your requ est as part of repair
or maintenance work.
Con venience and inf otainment functions
Yo u can store con venience settings and individ‐
ual settings in theve hicle and change or reset
th em at any time.
Depending on theve hicle equipment, this
includes thefo llowing settings, forex ample:
R seat and steering wheel positions
R suspension and climate control settings
R individual settings, such as interior lighting
Depending on the selected equipment, you can
import data into vehicle inf otainment functions
yo urself. 34
General no tes

#
Tointer rupt automatic operation: press or
pull theW button again.
% Automatic operation for closing is available
on lyforth e front side windo ws.
When theve hicle is switched off, you can con‐
tinue tooperate the side windo ws.
This function is available for around four minutes
or until a door is opened. All side wind
owscan be opened or closed simul‐
ta neously using button 1. #
Switch on the ignition. #
Toopen: press and hold button 1tothe
point of resis tance. #
Toopen ful ly:press and hold button 1
be yond the point of resis tance. #
Toclose: pull and hold button 1.
Au tomatic reve rsing function of the side win‐
do ws
If an obs tacle impedes a side window du ring the
closing process, the side window will open again
automaticall y.The automatic reve rsing function
is only an aid and is not a substitute foryo ur
attentiveness. #
During the closing process, make sure that
no body parts are in the closing area. &
WARNING Risk of becoming trapped
despi tethere being reve rsing pr otection
on the side window
The reve rsing function does not react:
R tosoft, light and thin objects, e.g. fingers.
R during resetting.
The reve rsing function cannot pr event some‐
one from becoming trapped in these situa‐
tions. #
During the closing process, make sure
th at no body parts are in the closing
area. #
If someone becomes trapped, press the
W button toopen the side window
again. Au
tomatic function of the side windo ws In
thefo llowing cases, the side windo wswill be
closed automatically when theve hicle is
switched off:
R if it starts torain Opening and closing
89

Re
setting seat settings Multimedia sy
stem:
4 Vehicle 5
a Seats 5
Reset #
Select YesorNo.
Depending on whe ther the settings forth e driv‐
er ’s or front passenger seat are selected, only
th e selected seat can be reset. Fo
lding the front seat backrest forw ards/
back (vehicles with memo ryfunction) If
yo ufo ld the seat backrest forw ards, the seat
will mo veforw ards with the EASY -ENTRY func‐
tion. This allo wspassengers toget into and out
of there ar passenger compartment com fortabl y. #
Tofold forw ard: pull seat release handle 1
and fold the seat backrest forw ards as far as
it will go.
The seat will auto maticallymo vetothefo re‐
most position. #
Tofold back: swingthe seat backrest back
horizon tally.
If th e seat backrest is not engaged, this will
be shown on the multifunction display on the instrument clus
ter.A wa rning tone will also
sound.
The seat will au tomatical lymo vetothe
st ored position. Fo
lding the front seat backrest forw ards/
backwards (vehicles with out memory func‐
tion) Fo
lding forw ards
If yo ufo ld the seat backrest forw ards, the seat
will mo veforw ards with the EASY -ENTRY func‐
tion. This allo wspassengers toget into and out
of there ar passenger compartment com fortabl y. 102
Seats and stowing

Operating
the memory function St
oring #
Set the desired position for all sy stems. #
Brief lypress memory button Vandthen
press preset position 4,TorU
within thre e seconds.
An acoustic signal sounds. The settings are
st ored. #
Tocall up: press and hold preset position
button 4,TorU until all the sys‐
te ms are in thestored position.
% When youre lease the preset position button,
st eering wheel, the seat and mir ror setting
functions stop immediatel y.The head-up dis‐
play continues tobe adjus ted. St
ow age areas Note
s on loading theve hicle &
DANG ER Risk of exhaust gas poisoning
Combustion engines emit poisonous exhaust
ga ses such as carbon monoxide. Exhaust
ga ses can enter theve hicle interior if the
boot lid is open when the engine is running,
especially if theve hicle is in motion. #
Alw ays switch off the engine before
opening the boot lid. #
Never drive with the boot lid open. &
WARNING Risk of inju ryfrom unsecu red
items in theve hicle
If objects, luggage or loads are not secured
or not secured suf ficientl y,they could slip,
tip ove r or be throw n around and thereby hit
ve hicle occupants.
There is a risk of injur y,particularly in the
ev ent of sudden braking or a sudden change
in direction. #
Alw aysstow objects in such a wayth at
th ey cannot be thro wn around. #
Before the journe y,secure objects, lug‐
ga ge or loads against slipping or tipping
ove r. &
WARNING Risk of inju rydue toobjects
being stowed incor rectly
If objects in theve hicle interior are stowed
incor rectly, they can slide or be thrown
around and hit vehicle occupants. In addi‐
tion, cup holders, open stowage spaces and
mobile phone brac kets cann otalw aysre tain
all objects they contain. 11 0
Seats and stowing

#
Tounlo ckthe left and right seat back‐
re st:pull right or left button 1.#
Fold cor responding seat backrest 2for‐
wa rds. #
If necessar y,reset the driver's or front
passenger seat.
Fo lding back there ar seat backrest &
WARNING Risk of becoming trapped
when adjusting the seats
When you adjust a seat, you may trap your‐
self or a vehicle occupant. #
When adjusting a seat, make sure that
no one has any body parts in the sweep
of the seat. *
NO
TEDama gecaused bytrapping the
seat belt when folding back the seat
backrest The seat belt could become trapped and
thus
be damaged when the seat backrest is folded
bac k. #
Make sure that the seat belt is not trap‐
ped when folding back the seat back‐
re st. #
Movethe driver's or front passenger seat for‐
wa rds, if necessar y. #
Foldthe cor responding seat backrest 1
back until it engages.
Left and right seat backrests: ifth e seat
backrest is not engaged and loc ked in place,
th is will be shown on the multifunction dis‐
play on the instrument clus ter.
A wa rning tone will also sound. Overvi
ewofthe tie-down eyes Obser
vethe no tes on loading theve hicle
(/ page 110). 11 4
Seats and stowing

Exterior lighting
Note
s on adjusting the lights when driving
abroad Ve
hicles with static LED headlamps: It is not
necessa ryto con vert the headlamps. The legal
re qu irements are also met in countries in which
traf fic drives on theot her side of thero ad.
Ve hicles with Intelligent Light Sy stem: before
crossing the border into count ries in which traf‐
fi c drives on theot her side of thero ad, it is nec‐
essary toset the headlamps tosymmetrical low
beam (/ page126).
On ce the headlamps ha vebeen con verted:
R Oncoming tra ffic will not be dazzled.
R The edge of thero ad will not be illuminated
as far or as high.
R The "mo torw ay mode" and "enhanced fog
light" functions will not be available.
The headlamps must be reset toasymm etrical
low beam when youre turn from ab road. Information about lighting sy
stems and your
re sponsibility The
various lighting sy stems of theve hicle are
only aids. The driver of theve hicle is responsible
fo r cor rect vehicle illumination in accordance
with the pr evailing light and visibility conditions,
legal requirements and traf fic situation. Light switch
Ope
rating the light switch 1
W Left-hand pa rking lights
2 X Right-hand parking lights
3 T Standing lights and licence plate light‐
ing
4 Ã Automatic driving lights (prefer red light
switch position) Light and sight
11 9

%
The duration until the colour changes varies
depending on the usage conditions. Mir
rors Operating
the outside mir rors &
WARNING Risk of inju ryifve hicle set‐
tings are adjus ted while theve hicle is in
motion
Yo u could lose cont rol of theve hicle in par‐
ticular in thefo llowing situations:
R Ifyo u adjust the driver's seat, the head
re stra ints, thesteering wheel or the mir‐
ro r while theve hicle is in motion.
R Ifyo ufast enyour seat belt while theve hi‐
cle is in motion. #
Before starting the engine: adjust the
driver's seat, head restra ints, steering
wheel and mir ror in particular and fas‐
te nyo ur seat belt. &
WARNING Risk of accident due tomis‐
judgement of dis tance when using the
outside mir ror
The outside mir rors reflect objects on a
smaller scale. The objects in view are in fact
closer than they appear. #
Therefore, alw ays look over your shoul‐
der in order toensure that you are
aw are of the actual dis tance between
yo u and thero ad users driving behind
yo u. Fo
lding the outside mir rors in/out #
Brief lypress button 1.
Re setting the outside mir rors
% Ifth e battery has been disconnected or com‐
ple tely discharged, the outside mir rors must
be reset. Only then will the automatic mir ror
fo lding function workproperly. #
Brief lypress button 1. 13 0
Light and sight

R
Sensitive: higher system sensitivity. The
driver is warned earlier and the attention
le ve l de tected byATTENTION ASSIST is adap‐
te d according ly.
If dr owsiness or increasing lapses in concentra‐
tion are de tected, theATTENTION ASSIST: Take
a break! warning appears in the Instrument Dis‐
pla y.Yo u can ackn owledge the message and
ta ke a break where necessar y.Ifyo u do not take
a break and ATTENTION ASSIST continues to
de tect increasing lapses in concentration, you
will be warned again af ter a minimum of
15 minutes. Yo
u can ha vethefo llowing status information for
AT TENTION ASSIST displa yed in the assis tance
menu of the on-board computer:
R The length of the journey since the last
break.
R The attention le vel de term ined byATTENTION
ASSIS T.
If AT TENTION ASSIST is unable tocalculate the
attention le vel and cannot issue a warning, the
System suspended messageappears.
If a warning is given in the Instrument Displa y,
th e multimedia sy stem of fers to sear chfor a rest
area. You can select a rest area and start naviga‐
tion tothis rest area. This function can be activa‐
te d and deactivated in the multimedia sy stem.
If AT TENTION ASSIST is deactivated, theÛ
symbol appears in the assis tance graphic in the
Instrument Display when the engine is running.
AT TENTION ASSIST is activated automatically
when the engine is re-sta rted. The last selected
sensitivity le velre mains stored. Sy
stem limits
AT TENTION ASSIST is active in the 60 km/h to
200 km/h speed range.
Pa rticularly in thefo llowing situations, ATTEN‐
TION ASSIST only functions in a restricted man‐
ner and warnings may be dela yed or not occur:
R Ifyo u ha vebeen driving for less than appr ox‐
imately 30 minutes.
R Ifth ero ad condition is poor (une venro ad
sur face or po tholes).
R Ifth ere is a strong side wind.
R Ifyo u adopt a sporty driving style (high cor‐
nering speeds or high rates of acceleration).
R IfAc tive Steering Assist is activated and
active .
R Ifth e time has been set incor rectly.
R Ifyo uch ange lanes and vary your speed fre‐
qu ently In active driving situations.
The ATTENTION ASSIST dr owsiness or alertness
assessment is reset and restar ted when continu‐
ing the journey in thefo llowing situations:
R Ifyo u swit choff the engine. Driving and parking
175

-
System settings
R add your ow nfa vo urites (/page 252)
R rename favo urites (/ page 252).
R movefavo urites (/ page 252).
R dele tefavo urites (/ page 252).
R reset all favo urites (/ page 252)
Calling up favo urites #
Press the© button.
The main functions are displa yed. #
Navigate down wards once.
Na vigating means:
R Swiping on theTo uch Control or the
to uchpad
R Sliding the controller
Leaving thefa vo urites menu #
Press the© button.
Ad ding favo urites
Ad ding prede fined favo urites #
Press the© button.
The main functions are displa yed. #
Navigate down wards twice.
The Favourites menu appears. #
Select New favourite.
The categories are displ ayed. #
Select a categor y.
The favo urites are displ ayed. #
Select a favo urite. #
Store thefa vo urite at the desired position.
If a favo urite has already been added at this
position, it will be overwritten.
Example: adding your ow nfa vo urites #
Select Vehicle. #
Select Full screen: Consumption . #
Press and hold the© button until the
fa vo urites are displ ayed. #
Store thefa vo urite at the desired position.
If No function available for saving is shown,the
selected function cannot be added.
Re naming favo urites #
Press the© button.
The main functions are displa yed. #
Navigate down wards once. #
Select a favo urite. #
Navigate down wards once.
The Favourites menu appears. #
Select Rename. #
Enterth ech aracters. #
Toconfirm the entr y:select ¡.
Moving favo urites #
Press the© button.
The main functions are displa yed. #
Navigate down wards once. #
Select a favo urite. #
Navigate down wards once.
The Favourites menu appears. #
Select Move. #
Movethefa vo urite tothe desired position.
If a favo urite has already been added at this
position, it will be overwritten.
Deleting favo urites #
Press the© button.
The main functions are displa yed. 252
Multimedia sy stem